Thank you for this, and I'm so glad you've evolved these five elements and more over time.
You raise a good point, and I believe it relates to the maxim:
"How one does the small things is how one does the big."
(ie: If someone puts little effort into their thumbnail, avatar, or headlines, it's fairly reasonable to conclude there won't be much effort in the rest of their content.
Is this always true? Perhaps, perhaps not. But the main thing is, this is how viewers are often making decisions on what to click.
My pleasure, thank you for contributing to the discussion! 🙏